feat(call): Details card for the call-ended toast (#253)

The call-ended toast gets a Details button (and stays 10 s) that opens a
card with who was in the call and the peak, connection verdict and
reconnects, how long your / each person's / everyone's connection was
poor (likely the server when everyone), RTT, packet loss and jitter, and
your talk, mute, deafen and screenshare time, in technical wording.
Deafened time is tracked by CallEmbed; the rest comes from the fork's new
io.lotus.call_summary `details` (lotus.29). Settings → Calls gets
"Summary After Calls" (on by default).

Fixes #253

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_017PCb59uY3UKqDqt7B6hzd5

src/app/state/toast.ts

@@ -13,6 +13,8 @@ export type ToastNotif = {
   onClick?: () => void; // custom click handler; skips hash navigation when set
   sticky?: boolean; // when true, does not auto-dismiss — use for action toasts that require a click
   onDismiss?: () => void; // called when the user closes the toast with its X (not on click/eviction)
+  actionLabel?: string; // [Gitea #253] a small button on the toast, e.g. "Details"
+  onAction?: () => void;
   createdAt?: number; // set by toastQueueAtom when enqueued; used for #80 eviction ordering
 };